Abstract: In an apparatus and method for controlling an array antenna comprising a plurality of antenna elements arranged so as to be adjacent to each other in a predetermined arrangement configuration, a plurality of received signals received by the antenna elements is transformed into respective pairs of quadrature baseband signals, using a common local oscillation signal, wherein each pair of quadrature baseband signals is orthogonal to each other. Then predetermined first and second data are calculated based on each pair of transformed quadrature baseband signals, and are filtered using a noise suppressing filter. Respective elements of a transformation matrix for in-phase combining are calculated based on the filtered first and second data, and the received signals obtained from the each two antenna elements are put in phase based on the calculated transformation matrix. Thereafter, a plurality of received signals which are put in phase are combined in phase, and an in-phase combined received signal is outputted.

Abstract: An alignment adjusting system for use in an optical system in an optical transceiver includes an optical antenna having a main mirror and a submirror, both of which are provided around an optical axis of the optical antenna. An optical coupling unit couples the optical antenna to the optical transceiver. The optical antenna transmits a beam of transmitting light output from the optical transceiver to an optical antenna of a destination station after sequentially reflecting the beam of transmitting light by the submirror and the main mirror. A return-reflection mirror provided in either one of the main mirror and the submirror return-reflects a part of the beam of transmitting light.